<template>
  <view class="container">
    <!-- 空白页 -->
    <view v-if="!hasLogin || empty === true" class="empty">
      <image src="/static/emptyCart.jpg" mode="aspectFit"></image>
      <view v-if="hasLogin" class="empty-tips">
        空空如也
        <navigator
          class="navigator"
          v-if="hasLogin"
          url="../index/index"
          open-type="switchTab"
          >随便逛逛></navigator
        >
      </view>
      <view v-else class="empty-tips">
        空空如也
        <view class="navigator" @click="navToLogin">去登陆></view>
      </view>
    </view>
    <view v-else>
      <!-- 列表 -->
      <view class="cart-list">
        <block v-for="(item, index) in cartList" :key="item.id">
          <view
            class="cart-item"
            :class="{ 'b-b': index !== cartList.length - 1 }"
            @click="goToItemDetail(item)"
          >
            <view class="image-wrapper">
              <image
                :src="item.productPic"
                :class="[item.loaded]"
                mode="aspectFill"
                lazy-load
                @load="onImageLoad('cartList', index)"
                @error="onImageError('cartList', index)"
              ></image>
              <view
                class="yticon icon-xuanzhong2 checkbox"
                :class="{ checked: item.checked }"
                @click.stop="check('item', index)"
              ></view>
            </view>
            <view class="item-right">
              <text class="clamp title">{{ item.productName }}</text>
              <text class="attr">{{ item.spDataStr }}</text>
              <text class="price">¥{{ item.price }}</text>
              <uni-number-box
                class="step"
                :min="1"
                :max="100"
                :value="item.quantity"
                :index="index"
                @eventChange="numberChange"
              ></uni-number-box>
            </view>
            <text
              class="del-btn yticon icon-fork"
              @click="handleDeleteCartItem(index)"
            ></text>
          </view>
        </block>
      </view>
      <!-- 底部菜单栏 -->
      <view class="action-section">
        <view class="checkbox">
          <image
            :src="allChecked ? '/static/selected.png' : '/static/select.png'"
            mode="aspectFit"
            @click="check('all')"
          ></image>
          <view
            class="clear-btn"
            :class="{ show: allChecked }"
            @click="clearCart"
          >
            清空
          </view>
        </view>
        <view class="total-box">
          <text class="price">¥{{ total }}元</text>
        </view>
        <button
          type="primary"
          class="no-border confirm-btn"
          @click="createOrder"
        >
          去结算
        </button>
      </view>
    </view>
  </view>
</template>

<script>
import { mapState } from 'vuex';
import uniNumberBox from '@/components/uni-number-box.vue';
import {
  fetchCartList,
  deletCartItem,
  updateQuantity,
  clearCartList,
} from '@/api/cart.js';
export default {
  components: {
    uniNumberBox,
  },
  data() {
    return {
      total: 0, //总价格
      allChecked: false, //全选状态  true|false
      empty: false, //空白页现实  true|false
      cartList: [],
    };
  },
  onLoad() {
    // this.loadData();
  },
  onShow() {
    //页面显示时重新加载购物车
    this.loadData();
  },
  watch: {
    //显示空白页
    cartList(e) {
      let empty = e.length === 0 ? true : false;
      if (this.empty !== empty) {
        this.empty = empty;
      }
    },
  },
  computed: {
    ...mapState(['hasLogin']),
  },
  methods: {
    goToItemDetail(item) {
      console.log(138, item);
      uni.navigateTo({
        url: `/pages/product/product?id=${item.productId}`,
      });
    },
    //请求数据
    async loadData() {
      if (!this.hasLogin) {
        return;
      }
      fetchCartList().then((response) => {
        let list = response.data;
        let cartList = list.map((item) => {
          item.checked = true;
          item.loaded = 'loaded';
          let spDataArr = JSON.parse(item.productAttr);
          let spDataStr = '';
          for (let attr of spDataArr) {
            spDataStr += attr.key;
            spDataStr += ':';
            spDataStr += attr.value;
            spDataStr += ';';
          }
          item.spDataStr = spDataStr;
          return item;
        });
        this.cartList = cartList;
        this.calcTotal(); //计算总价
      });
    },
    //监听image加载完成
    onImageLoad(key, index) {
      this.$set(this[key][index], 'loaded', 'loaded');
    },
    //监听image加载失败
    onImageError(key, index) {
      this[key][index].productPic = '/static/errorImage.jpg';
    },
    navToLogin() {
      uni.navigateTo({
        url: '/pages/public/login',
      });
    },
    //选中状态处理
    check(type, index) {
      if (type === 'item') {
        this.cartList[index].checked = !this.cartList[index].checked;
      } else {
        const checked = !this.allChecked;
        const list = this.cartList;
        list.forEach((item) => {
          item.checked = checked;
        });
        this.allChecked = checked;
      }
      this.calcTotal(type);
    },
    //数量
    numberChange(data) {
      let cartItem = this.cartList[data.index];
      updateQuantity({ id: cartItem.id, quantity: data.number }).then(
        (response) => {
          cartItem.quantity = data.number;
          this.calcTotal();
        }
      );
    },
    //删除
    handleDeleteCartItem(index) {
      let list = this.cartList;
      let row = list[index];
      let id = row.id;
      deletCartItem({ ids: id }).then((response) => {
        this.cartList.splice(index, 1);
        this.calcTotal();
        uni.hideLoading();
      });
    },
    //清空
    clearCart() {
      clearCartList().then((response) => {
        uni.showModal({
          content: '清空购物车？',
          success: (e) => {
            if (e.confirm) {
              this.cartList = [];
            }
          },
        });
      });
    },
    //计算总价
    calcTotal() {
      let list = this.cartList;
      if (list.length === 0) {
        this.empty = true;
        return;
      }
      let total = 0;
      let checked = true;
      list.forEach((item) => {
        if (item.checked === true) {
          total += item.price * item.quantity;
        } else if (checked === true) {
          checked = false;
        }
      });
      this.allChecked = checked;
      this.total = Number(total.toFixed(2));
    },
    //创建订单
    createOrder() {
      let list = this.cartList;
      let cartIds = [];
      list.forEach((item) => {
        if (item.checked) {
          cartIds.push(item.id);
        }
      });
      if (cartIds.length == 0) {
        uni.showToast({
          title: '您还未选择要下单的商品！',
          duration: 1000,
        });
        return;
      }
      uni.navigateTo({
        url: `/pages/order/createOrder?cartIds=${JSON.stringify(cartIds)}`,
      });
    },
  },
};
</script>

<style lang="scss">
.container {
  padding-bottom: 134upx;

  /* 空白页 */
  .empty {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100vh;
    padding-bottom: 100upx;
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
    background: #fff;

    image {
      width: 240upx;
      height: 160upx;
      margin-bottom: 30upx;
    }

    .empty-tips {
      display: flex;
      font-size: $font-sm + 2upx;
      color: $font-color-disabled;

      .navigator {
        color: $uni-color-primary;
        margin-left: 16upx;
      }
    }
  }
}

/* 购物车列表项 */
.cart-item {
  display: flex;
  position: relative;
  padding: 30upx 40upx;

  .image-wrapper {
    width: 230upx;
    height: 230upx;
    flex-shrink: 0;
    position: relative;

    image {
      border-radius: 8upx;
    }
  }

  .checkbox {
    position: absolute;
    left: -16upx;
    top: -16upx;
    z-index: 8;
    font-size: 44upx;
    line-height: 1;
    padding: 4upx;
    color: $font-color-disabled;
    background: #fff;
    border-radius: 50px;
  }

  .item-right {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
    position: relative;
    padding-left: 30upx;

    .title,
    .price {
      font-size: $font-base + 2upx;
      color: $font-color-dark;
      height: 40upx;
      line-height: 40upx;
    }

    .attr {
      font-size: $font-sm + 2upx;
      color: $font-color-light;
      height: 50upx;
      line-height: 50upx;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .price {
      height: 50upx;
      line-height: 50upx;
    }
  }

  .del-btn {
    padding: 4upx 10upx;
    font-size: 34upx;
    height: 50upx;
    color: $font-color-light;
  }
}

/* 底部栏 */
.action-section {
  /* #ifdef H5 */
  margin-bottom: 100upx;
  /* #endif */
  position: fixed;
  left: 30upx;
  bottom: 30upx;
  z-index: 95;
  display: flex;
  align-items: center;
  width: 690upx;
  height: 100upx;
  padding: 0 30upx;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 20upx 0 rgba(0, 0, 0, 0.5);
  border-radius: 16upx;

  .checkbox {
    height: 52upx;
    position: relative;

    image {
      width: 52upx;
      height: 100%;
      position: relative;
      z-index: 5;
    }
  }

  .clear-btn {
    position: absolute;
    left: 26upx;
    top: 0;
    z-index: 4;
    width: 0;
    height: 52upx;
    line-height: 52upx;
    padding-left: 38upx;
    font-size: $font-base;
    color: #fff;
    background: $font-color-disabled;
    border-radius: 0 50px 50px 0;
    opacity: 0;
    transition: 0.2s;

    &.show {
      opacity: 1;
      width: 120upx;
    }
  }

  .total-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    text-align: right;
    padding-right: 40upx;

    .price {
      font-size: $font-lg;
      color: $font-color-dark;
    }

    .coupon {
      font-size: $font-sm;
      color: $font-color-light;

      text {
        color: $font-color-dark;
      }
    }
  }

  .confirm-btn {
    padding: 0 38upx;
    margin: 0;
    border-radius: 100px;
    height: 76upx;
    line-height: 76upx;
    font-size: $font-base + 2upx;
    background: $uni-color-primary;
    box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72);
  }
}

/* 复选框选中状态 */
.action-section .checkbox.checked,
.cart-item .checkbox.checked {
  color: $uni-color-primary;
}
</style>
